I am a die-hard Civ fan who was massively disappointed with Civ 5. I played an early release which was riddled with bugs and just couldn't decide if I liked the new format. I wanted to give it another try, but was hesitant to spend the $50+ dollars to do so.
Then came the weekend. Direct to Drive and Steam are offering Civ 5 at a %75 discount: $12.50. I can't actually say no to it at this price and the download is about to ensue.....
For the record, Civ III holds my all-time game-athon record at 26 hours straight. I wish I was kidding.